[expert] ktalkd does not send announcements

[Yongling Ding]

the same ktalkd configuration worked in 5.2 but stopped working under 6.1.
the secure log shows the connection attempts and there are many defunct
ktalkdlg. it seems that ktalkd tried to talke to me but somehow failed. i
think this may be due to some security features. anyone suggest a
workaround? thanks.